You will need

frozen fruit

yogurt, banana, sorbet (thickener)

almond milk, milk, or juice

protein powder (if desired)

honey or agave syrup (if desired)

cinnamon or other spices (to taste)

Step 1 Thaw frozen fruit.

If you put your frozen fruit in the blender while it's hard as a rock, your blender will not blend it! Leave your fruit sitting out for a bit (put the frozen fruit bag in a bowl, so the melting juice doesn't run all over) or leave your blender container sitting in the fridge overnight after step 2.

Step 2 Combine ingredients in blender.

Combine all ingredients in blender. You can add these ingredients in any ratio you like; keep in mind, however, that the more liquid (almond milk, milk, juice) you add, the thinner the smoothie will be. Also keep in mind that your blender's container will have much more space than your glass - take care not to overfill, lest you have enough smoothie for an army!

Protein powder can be added if desired (particularly for vegetarians or those building muscle); using a flavored protein powder (vanilla, etc.) can affect the overall flavor of the smoothie. Most of the time the fruit will be sweet enough that you won't need sugar, but if you find your smoothie lacking, stirring in a little honey or agave syrup usually does the trick. Adding cinnamon can do wonders in combination with honey or in smoothies that have blueberries in them.

Step 3 Serve and enjoy!

Now you're ready to drink your smoothie! Feel free to play around with combinations of fruits, liquids, and thickeners: the world is your oyster! A word of caution, though: when experimenting, it's best to make small portions. That way, if you make something you don't like, you won't have a lot of it to get rid of!